Came across an interesting site (see title of this post) having some good articles, code and tools with good explanations.
My favorites from the site are: HttpProxy server debugging your http requests and responses...
FindClassInJar utility finding that missing class file... Sometimes a simple utility can be very useful. FindClassInJar is a prime example, particularly if you are trying to piece together a classpath and keeping getting "ClassNotFoundException" errors in your appplication. FindClassInJar will use the java.util.zip package to rummage through a lib directory for zip or jar files containing the file you are missing. When it locates the first entry, it tells you to look in that file. The utility is aimed at Java developers looking for class files, but could be used to search for any file name in a directory of zips or jars.
PDF Report writer an xml config file is the GUI for this report writer... Gervase Gallant the author of this site writes, after a lot of experimentation with iText, an open source PDF writer package, I wrote an XML-reading layer to allow users' to set up data and formatting configuration, specifying everything from JDBC parameters to the font size of a particular column. Article Source Code